噪声污染{英文}.ppt

THE NOISE POLLUTION;In 1981, 300 audience lost consciousness and coma at modern open-air music held in the United States. In 1959, the United States, there are 10 voluntarily making noise test, when the experimental aircraft from flying over 10 volunteers 10-12 meters high, six people died on the spot. In 1960, the Japanese city of Hiroshima, a man was tortured by the noise from the nearby factory. He killed factory owners finally. ;The noise is so terrible !!!!!;一.About the voice;Amplitude and wavelength振幅和波长;People generally hear sounds between the “threshold of hearing” and the “threshold of pain”. In terms of pressure, this is 20 μPa – 100 Pa. The decibel scale was developed from this fact and makes numbers more manageable. The decibel scale generally ranges from approximately 0 to 130. ;The voice people don’t need and Interfere with people‘s normal life , work and rest is referred to as NOISE. Noise cause adverse effects on the surrounding environment. This kind of situation is called noise pollution. ;2.The characteristics of the noise;Noise is among the most pervasive pollutants today .;The most harmful noise in daily life is Mechanical noise (机械噪声).;Factory machinery;Traffic noise;Construction noise;Noise pollution has become the second to the air pollution in the environment risk factors. What are the harm of noise?What are the implications for human?;Damaging hearing, affect work, study, rest and sleep . Causing disease, affect human body health. The service life of the machinery and equipment can be affected by strong noise, The growth of plants and animals are damaged. ;四.Prevention and control of noise;Public security department supervise and manage the traffic noise, noise of social activities. Railway departments supervise and manage the station using the horn and the train running noise.;1.Measures for the prevention and control of industrial noise pollution ;2.The measures to prevent the traffic noise pollution ;3.The Measures of public nois